Octave is primarily intended for numerical computations.
This site serves as a quick reference for Octave. Explanations, examples and online computations.
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GNUPLOT ... Data and Function Plotting Utility
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MAXIMA ... Algebra Solutions Utility
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MOPAC ... Semi-empirical Quantum Chemistry Utility
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PostScript ... CAD
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R ... Statistical Computing and Graphics
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SPICE ... Circuit Design and Analysis